1 / 1

MAN-HEP

wells
Télécharger la présentation

MAN-HEP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The MB-NG project is a major collaboration between different groups. This is one of the first projects to bring together users, industry, equipment providers and leading edge e-science application. Technically, it enabled a leading edge U.K. Diffserv enabled network running at 2.5 Gbit/s; configured and demonstrated the use of MPLS traffic engineering to provide tunnels for preferential traffic; deployed a middleware to dynamically reserve and manage the available bandwidth-on a per-flow level-at the edges of the network; investigated the performance of end-host systems for high throughput; deployed and tested a number of protocols designed to tackle the issue of standard TCP in long fat pipes and finally demonstrated the benefits to the application of the advanced network environment. MB-NG Managed Bandwidth BB BB BB BB CCLRC Manchester HPCx CSAR UKERNA MAN-HEP MAN-MCC Warrington UCL-Chemistry London APPLICATION / GUI APPLICATION / GUI RAL UCL-HEP request NRSE NRSE Reading ULCC configure data CORE BABAR SurfNet Netherlands Starlight Chicago Applications: GridFTP vs APACHE Domain C BB Bandwidth Broker Traffic flows Signalling between BB Provisioning devices Core Domain Frequency N Domain A Domain B Mbits/s Time μs GridFTP Distribution of Throughput GridFTP Time Series Frequency N Mbits/s APACHE Distribution of Throughput Time μs APACHE Time Series TCP and High Throughput QoS Middleware: GRS - Grid Resource Scheduling • Standard TCP transfers data memory-to-memory across MB-NG at 941 Mbits/s. This is the maximum “line rate” for TCP. • The MB-NG network is QoS enabled with three classes using DiffServ. • WHAT IT IS: • Middleware component to reserve network bandwidth dynamically; • Based on a model where QoS is managed locally at each edge site and the bottleneck is at the edge. • HOW IT WORKS: • A Network Resource Scheduling Entity (NRSE) manages a single site and stores information about local network resources and users; • A request can be issued via a GUI (from an end-user) or an API (from an application); • Authentication is performed locally on the local user and then between NRSEs to improve scalability and to support multi-domain operation; • Bi-directional reservations that require bandwidth to be reserved on both directions are supported; • Reservations between any two sites can be initiated from a third remote site; • GRS AND MB-NG: • MB-NG is the first deployment on a WAN of GRS; • NRSE has a locally-programmable back-end to ensure that the router configuration is consistent and correctly restored after the reservations are completed; • Traffic that matches the reservation parameters is marked and guaranteed enough bandwidth before entering the core in the edge router. • FUTURE GOALS: • Currently planning a version to work in an environment where bottlenecks may occur anywhere in the network; • Possible integration with MPLS in order to have GRS establishing end-to-end Tunnels. Congestion point 2.5Gbit/s 24 hours continuous Transfer TCP mem-mem at line rate. Manchester Traffic flow London RAL 2 Classes: Voice 20%, BE 80% QoS switched on • An issues with standard TCP is its performance in high bandwidth-delay networks • New TCP stacks being proposed to deal with thid issue (HSTCP, STCP, H-TCP, FAST, ….) • In low RTT-high bandwidth environment, standard TCP performs just as well as the new stacks. In high RTT-high bandwidth environments, the new stacks are more reactive to losses. 3 Classes: EF 33%, BE 57%, LBE 10% QoS switched on TCP in high bandwidth networks: Short RTT vs long RTT RTT~6ms RTT~120ms RAID Studies Disk-to-disk performance across MB-NG using RAID5 • Read speed: • line rate. • Write speed: • For small files less than 400MBytes = line rate • For larger files ~ 600 Mbits/s. • Optimal performance obtained using optimal hardware configuration • RAID 5 disk arrays give high read/write speeds together with built in redundancy to ensure fault tolerance. Max read speed ~ 1300 Mbit/s Middleware: GARA – General-purpose Architecture for Reservation and Allocation Write speed (large files) ~ 600 Mbit/s Applications: Reality Grid • Developed as part of the Globus project. • GARA provides end-to-end QoS to the applications using three types of Resources Managers (RM) • In our case, we just make use of the Network RM (Differentiated Services). It allows immediate and advance reservations. Parameters needed in a reservation are: • Reservation type: network (or cpu, disk) • Start Time: seconds from Epoch • Duration: seconds • Resource-specific parameters :e.g. bandwidth… Realtime remote visualisation: • Processing in London, visualisation in Manchester. • Without QoS, the level of background traffic affects the application performance. • With QoS, the applications is protected from the background traffic. • QoS setting: 10% (230 Mbit/s) of 2.5 Gbit/s bottleneck reserved for EF. The average application throughput of 65 Mbit/s is sufficient for a usable refresh rate Visualisation Server Visualisation client Steering Simulation data Through the use of MB-NG Reality-grid The TeraGyroid project won the HPC Challenge Award for Most Innovate Data-Intensive Application at SuperComputing 2003 in Phoenix, Arizona. Manchester Computation node London MPLS: Multiprotocol Label Switching • BASICS: • Layer 2.5 switching technology developed to integrate IP and ATM. • Forwarding based on label switching; • Traffic Engineering extensions allow the use of different routing paradigms compared with routing based on the shortest path as found in IP networks; • MPLS Tunnels, using RSVP, help with emulating virtual Leased Lines; • RSVP allows for easy accounting and better utilization of all the available bandwidth; • Provides reroute techniques comparable with SONET in terms of speed; • Other possible use of MPLS (VPNs, AToM, etc) use different protocols. • MPLS & MBNG: • Deployed in the core of the MB-NG network; • Carried extensive testing to check capabilities of Tunnels in respect of bandwidth reservation; • Because RSVP works on the control plane only, QoS still need to be extensively deployed. • CONCLUSIONS: • MPLS with Traffic Engineering extensions helps in enabling efficient utilization of available networks resources; • Tunnels ease end-to-end traffic management but are not a complete solution to bandwidth allocation; • QoS needs to be deployed all over the MPLS core. • Raid0 with 4 disks in the array. • Transfer of 2 Gbyte files from London to Manchester • GridFTP average throughput of 520 Mbit/s APACHE average throughput of 710 Mbit/s.

More Related